Tree up to 50 m by 65(-195) cm ø, sometimes buttressed. Branchlets terete, sometimes slightly 4-angular. Leaves subcoriaceous, often elliptic to elliptic-oblong, sometimes ovate to ovate-oblong, rarely obovate or broad-obovate, 8-25 by 4-10 cm; base obtuse to rounded, sometimes cuneate, usually subpeltate; apex acute, sometimes acuminate (acumen up to 1 cm), rarely apiculate, usually dried and breaking off in the herb.; nerves 6-12 pairs; petiole terete, rarely sulcate above near the distal end, 1.5-2.5 cm. Panicles up to 12 cm long, sometimes branching from near the base, branchlets rather stout, obliquely spreading. Peduncle obscure, sometimes up to 7 cm. Pedicels 5-9 mm. Flowers 10-13 mm ø. Calyx almost as large as the disk, distinctly 5-lobed, lobes triangular, acute, short-ciliate. Petals broadly ovate or suborbicular with undulating margins, yellow, 3-4 mm long and wide, appendage transverse cristate or lamellate, rarely fimbriate, usually manifest (sometimes small especially on the specimens from Borneo), attached at the lower half or sometimes at about the middle, sometimes divided into 3, and the middle one almost reaching the apex of petals. Disk red, concave and cup-shaped in the bud, flat or dish-shaped at anthesis, c. 5 mm ø, distinctly 5-lobed to almost orbicular, lobes epi-petalous. Stamens inserted near the ovary; filaments c. 2½ mm; anthers oblong or slightly ovoid, apiculate, c. 1.5 by 1 mm. Pistil red, c. 2 mm emerging from the disk. Ovary triangular and narrowed upwards into the style; ovules 12-18 in each cell. Fruits 10-15 cm long. Seeds (incl. wing) 6.5 by 1.5 cm, seed proper 4.75 by 1 cm.
Everwet lowland forests, in riverine forest, temporarily inundated forests, sometimes near the shore just behind high-water mark, but also on sandy dryland and coral limestone; in India ascending to 900 m ( BEDDOME Fl. Sylv. 1 1869 t. 145 ).
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